EXC_FD
if (sc->bce_mii.mii_media_active & IFM_FDX && !(reg & EXC_FD))
reg | EXC_FD);
else if (!(sc->bce_mii.mii_media_active & IFM_FDX) && reg & EXC_FD)
reg & ~EXC_FD);